Rotary disk drill.



H. R. HUGHES,

ROTARY DISK DRILL APPLICATION FlLgD DEc.29.1916.

Patented May 29, 1.917.

1&2279911.,

drill, the drill in my y tion of the cutters.

im'. een.

HOWARD n. nue-HES, 0E noUsToN, TEXAS, AssIoNon To HUGHES Toor. COMPANY,or

noUs'roN, TEXAS, A coEroRnTIoN or TEXAS.

ROTARY DISK DRILL- Learnit.

Specification of Letters Patent.

Application ledlDeceinter 29, 1916. 'Serial'td 139,620.

To all 'whom t may concer/n.'

Beit known that l, HOWARD R. HUGHES, a citizen 'of the United States,residing at Houstomin the county of Harris, State of Texas, haveinvented new and vuseful lmprovements in Rotary Disk Drills, of whichthe following is a specication.

This invention relates to rotary boring" drills of a typ'e knowncommercially'asl disk drills, which are eqiiipped with one or moresubstantially dis -shaped cutters rotably mounted and arranged in asubstantially. upright position in the head of the present' inventionbeing Similar to that typ Patent No. 1204157, on which device itis 'animprovement.

'The object of my present invention is to provide a practicable diskdrill that is eilicient and strong, and so arranged as to be inexpensiveof manufacture and easilv kept inserviceable condition.

Another object is 'to .mount `the cutters on the lower portion of thedrill head in such manner that Mthe upper portions of these cutters arehoused by an overhanging portion of the drill head to thus more fully fprotect them when the drill is in operation,

and to further tend to lessen packing of cut tings or-disintegratedmaterial from the bottom of the hole being drilled around theautters insuch manner as to prevent ready rotation of the cutters upon theirbearings.

Still another object of my present inven A tion is to so arrange thewater courses through the drill head that the Vlower ends thereof openin the recesses in the drill head housing the cutters, the outlets ofthese water 'courses being located inside of the cutters to thus brinthe full force of the water issuing there om to bear upon the upperporlhis arrangement of water courses tends to wash the cutters clear ofdisintegrated material and further to prevent the influx of suchdisintegrated material to the space or clearance betweenl theupperportions of the cutters and the adj acent walls of the drill`head.

Figure 1 is a slde elevation of the bit forming the subject of myinvention, parts thereof being shown in section and other AlPeuteritedMay 29, 1191"?.

parts removed to better yillustrate the inven'- l tion.

Fig. 2 is a side elevation of the drill disclosed in `Fig. 1',`taken atright angles'to` Fig. 1. 1 Y

Fig. 3 is an end view of the device, with the cutters removed.

Referring to the drawings which illustrate the preferred form of myinvention, A designates thehead ofthefdrill, which vis provided at itsupper end with an externally threaded portlon 1 adapted to receive acollar, not shown, which collar is in turn adapted to receive the end ofa hollow drill stem, also not shown. arllhe lower end of the head A iscut away on each side, as clearly shown at 2, a spindle 3 being rigidlycon- -nected to this cutaway portion of the drill head. Mounted upon thespindles 3 are substantially disk-shaped cutters B, which cutters arearranged in a substantially upright position on the head A. As shown,each cutter is provided with la beveled edge that -f has cutting teeth4f thereon, extending transversely across Athe same, and .in addition isprovided on itsinner side with a tapered -portion having teeth 5,-asmost 4clearly shown l1n Fig. 1. The precise method of `mounting thesecutters upon the spindles forms no part of this invention, but any of-the methods shown Ain* my various patents, l such as my patent above2referred to, may be usedx Further,`v the preclse formof the disk cuttersis not important in so far as regards my present invention, for any Aofthe usual form of vsuch cutters may be used ywithout departing trom/thespirit of my invention. At the upper end of each cutaway portion, thedrill head is recessed to form a pocket-like Vrecess 6. 'lhe walls ofthis pocket-likev recess are so shaped as to conform to theshape of thedisk cutters used. The upper wall of this rcess extends radially asuiicient distance to overhang the cutters, and this wall is furthershaped to. conform to the circumference of the disks being extendedlongitudinally of the drill head a -sulicient distance to shroud oroverhang a substantial portion of the disks.- ln other words, the wallsof these pocket-like recesses are shaped to conform to the shape of thecutting disks, and the recesses are of such depth radially andlongitudinally that the walls thereof completely house or shroud asubstantial portion of the disks. As used, in

is shaped to conform to the entire concave Side of the disk, as isclearly shown in Fig. l.

Y As best shown in Fig. 2, the upper walls of the recesses are soarranged with relation to the periphery of the disk cutters that theclearance or space between such walls and the periphery of the cuttersincreases progressively in the direction of rotation of the cutters. ltis evident, therefore, that packing of cuttings or disintegratedmaterial around the disk cutters in the housing recesses will beeliminated, for any material suciently small' tofpass the point Y willbe readily accommodated by all other portions of the clearance space.`inasmuch as.

movement through this space because of rotation of the cutters willbring such mate-A rial progressively into the increasing clearancespace. It is evident, therefore, that clogging is eliminated andsticking or bind- Y ing of the rollers prevented.

Arranged longitudinally through the head is a plurality of waterpassages 7, the upper ends of which are located in the reducedextension 1. The lower ends of these water passages open into thepocket-like recesses 6 and are so located in these recesses that jets ofwater issuing therefrom strike against the inner faces of the/cuttingdisks, as clearly shown in Fig. l, these passages being so arranged thatjets of water` issuing therefrom strike the cutters at an angle, theline of movement of such jets of water being contrary to the directionof rotation jof the cutters. rllhis arrangement further tends to.prevent the indux of disintegrated material into thepocket-like'recesses," for the jets of water issuing from these passagesenter ripheries ofthe cutters through'which disintegrated materialenters into such pockettrance of material carried by the disksl into theclearance space.

In, assembling this devi, the disk cutters are moved radially intotliepocket-like recesses and onto the spindles 3,' after which retainingdevices are applied'to the ends of the spindles.

Upon the upper end of the drill head and as a still further reducedextension upon the reduced extensionl l is located a thread'- ed sleeve8 adapted ,to receive a lubricant retainer, not shown, l

, side` the cutters. the pocket-like recesses at points therein adjacenttothatportion of the clearance spacev between the-'walls of the recessesand the penea'nei i structed that the cutting disks are housed or,v w

shrouded so as to furnlsh ample protection therefor, and to furtherprotect thosev cutting disks from the pacldng or clogging of materialtherearound, which would tend to prevent rotation thereofrwhcn. thedrill is in operation, andthus cause the cutting disks to drag, whichwould result inkthe rapid wearing out "of the'se'disks. l

Having thus described my invention, what l claim and wish to secure byLetters-Patent is:

l. A drill comprising a head, recesses in opposite sides of one end ofthe head, diskshaped cutters mounted in the recesses, the

inner walls of the recesses shaped to conform to the shape of thecutters, the upper walls ofthe recesses extending radially entirely overthe. upper part of the cutters,

and water courses opening into the recesses adjacent the cutters j 2. Adrill comprising a head, recesses in opposite, sides of one end of thehead, spindles upon the head, and projecting into thel recesses,disk-shaped' cutters mounted on the spindles, the upper walls of therecesses extending radially to -overhang the cutters, said walls beingshaped on the inner side to conform to the peripheries of the cuttersand so extended as .to house a sub stantial portion of the cutters 3. Adrill comprising a head, recesses in opposite sides of one end of thehead, diskshaped cutters mounted in the recesses, the inner walls of therecesses conforming to the shape of the cutters and the upper wallsextending .radially and longitudinally td covea substantial part of thecutters, and

water passages openlng into the recesses in- 4.' A drill comprisingahead the lower lend of which is cut away on both sides,

pockets in the head adjoiningthe cutaway portions, disk shaped cuttersmounted on the. cutaway portions of the head,`the vupper parts' of thesecutters extending into the pockets, the upper walls ofthe pocketsextending radially and longitudinally' of the drill head to 'entirelyhouse a substantial portion of the upper part of the cutters, and

water passages opei'iinginto the pockets inside thecutters.

'5. A drill comprising a head the lower end of which is cut away onfbothsides, that' -part of the head at the-upper end of the cutaway portionbeing recessed on both sides,

disk-shaped cutterspartly housed in the reeesses, the upper walls of therecesses entirely overhanging the cutters and covering a substantialportionA of the upper part of theperlphery thereof, water coursesopening into the recesses through the upper walls end of which is cutaway on opposite sides, y

recesses in the head at the upper end of the cutaway portions,diskshaped cutters mounted on the cutaway portions, the upper parts ofthe cutters extending into the recesses, the inner walls of the recessesbeing shaped to conform ters, the upper wall of each recess beingextended radially to overhang the cutters, the depth of the recessesbeing such that substantial portions of the cutters are housed therein,water courses opening into the recesses and so arranged that jets ofwater issuing therefrom will strike against the inner faces ofthecutters adjacent to side walls of the recesses, the current of said jetsbeing in a direction contrary to the rotation of the cutters.

7 A drill comprising a head, the lower end of which is cut away on bothsides, that part of the head at the upper end of the cut-away portion[being recessed on both sides, disk-shaped cutters artly housed in therecesses, the upper wal s of the recesses entirely overhanging thecutters and cov- Yering a substantial part of the upper portion of theperiphery thereof, Vthese walls being so arranged that the space betweeneach wall and the periphery of the correvspace between the walls of theto the shape of the cutsponding cutter increases progressively in thedirection of rotation of the cutter, water courses in the head openinginto the recesses and so arranged that jets of water therefrom issueinto the small end of the recesses and the peripheries of the cutters,the How of such jets of water being at an angle to the `longitudinalaxis of the drill head and against the direction of rotation of thecutters.

8. A drill comprising ahead, the lower end of which is cut away on bothsides, that part of the head at the upper end of the cut-away portionbeing recessed on both sides, disk shaped cutters partly housed in therecesses, the upper walls of the recesses entirely overhanging thecutters and covering a substantial part of the upper portion of theperiphery thereof, the said upper walls being so arranged that theclearance between these walls and the peripheries of the cutters isgreater at one 31de of the recesses than at the other, this clearanceincreasing progressively in the direction of rotation of the cutters,water courses in the head opening into the recesses adjacent the Side ofleast clearance, and so arranged that jets of water issuing therefromimpinge upon the periphery of the cutters at an angle, the ow of suchwater being contrary to the direction of rotation of the cutters.

ln testimony whereof, ll hereunto aiiix my signature thisthe 26th day ofDecember, 1916.

HOWARD R. HUGmS.

